6.1 Best Conditions To Shoot For Photogrammetry
If you don’t know what photogrammetry is, or want to know more before you shoot, read part 1
Best Conditions To Shoot For Photogrammetry
Step 1. Location.
The software performs best when shooting the subject outdoors with ample light.
Step 2. Camera settings.
Use a high f-stop number to increase sharpness throughout the image and reduce blurriness.
Blurry images will negatively affect the stitch.
Adjust the ISO according to the lighting conditions.
NO ZOOMING! Use a prime lens instead (if you have access to one). To capture details, move closer to the subject physically.
Step 3. Lighting conditions.
Opt for cloudy or overcast days with soft, diffused light. Avoid specular light.
Step 4. Shooting order.
Use a monopod for stability.
Move around the subject in a circle, taking small 5 to 10-degree increments.
Experiment with different distances, as both far and close shots can yield good stitches.
If taking close-up shots, move back and forth around the subject.
Example Model and Photo Inputs
The model in this turntable is not the same as from the photos above. Those models are too heavy for this type of web display.
Ensure the subject occupies around 70% of the frame and remains still throughout the process. Place additional objects around the subject to assist with stitching, as the software can track their relative movement from frame to frame. Notice the C-stand with action figures placed on it, the tennis balls, Thor’s hammer, the tiki torch
For room photography, walk around the perimeter, facing the center. Read the Skybridge article for more details on capturing indoor spaces.
By following these steps, you can create the best conditions for successful photogrammetry.
Post Processing
Once all photos are captured, they can be imported into the photogrammetry software. To retain as much data as possible, it's recommended to shoot in RAW format, which allows for greater manipulation during post-processing before submitting the photos for photogrammetry.
The software, previously known as Memento during its beta phase and now called Remake, accepts a maximum of 250 photos for one model. These photos must be in .jpg format, so make sure to convert the images to this format before uploading them to the software.
Exporting
After receiving a satisfactory 3D model, there are a few recommended steps to take before exporting:
Decimate the model to reduce the number of polygons.
Convert to quads for optimal integration with animation or live action. (Note: This step may vary for gaming or 3D printing purposes. Gaming is about the lowest poly count and 3D printing is about volume not topology.)
Export a low-poly version as well to speed up the pipeline and workspace in applications like Maya or Nuke.
Notes:
Memento no longer exists as it was replaced by Remake, and then later Recap
This process is not advisable for most indie film and 3D artists as there are better and cheaper alternatives now
I currently use Scaniverse and Polycam
The current workflow I use now is just using these tools as better references to import into Maya to model from for accuracy and for proxy models. I do not spend too much time worrying about my lighting or other objects in the scene
I have not used a NERF system yet, but some of the results look fantastic
